One of cat64s links (multiplication.com) had an advert for this, which I've just downloaded and tried out Timez Attack - free version teaches all the times tables from 2s to 12s... paid for version gives you more worlds to explore. It looks awesome - it's a proper game not just a flash doobrey.

If ds1 likes it, I'm seriously considering buying the full version, just to support them giving it out for free.